MacBook Pro Fan Running Constantly After Upgrade

After upgrading my 2007 MacBook Pro to Snow Leopard, the fans run at high speed and almost continuously. This wasn't the case prior to the upgrade, in fact I almost never heard the fans before. Is anyone else having this same problem after upgrade? Any idea what the fix is?

Sorry. Let me just give you the steps to get rid of this instead of giving you a link

1. Turn off the Macbook.2. Remove the battery.3. Unplug the powercord.4. Press the power button for ten seconds.5. Plug the Macbook powercord back in.6. Turn on the computer and hold down the command-option-P-R keys until you hear a second chime.

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